Changes of Soil Nutrients in Summer Corn Field during Different Flood Duration
The study of the distribution and changes of soil hydrolyzed nitrogen,available phosphorus,available potassium,and organic matter in typical flooded summer corn fields of Weihui City,Henan Province in July 2021 will provide efficient fertilization strategies for post disaster farmland reclamation.The results showed that there was no significant difference in the distribution of hydrolyzed nitrogen within the 0-40 cm soil layer for different flooding duration of 1-2,5-7,10-12,20-25 and over 30 days,while in 40-60 cm soil layer of cultivated land with flooding duration≥10 d it was significantly lower than that of cultivated land with less than 10 d.However,the content of available phosphorus in 20-40 and 40-60 cm soil layers increased with the increase of flooding days overall.The longer the flooding time of 0-20 cm soil layer,the higher the content of available potassium overall.The content of available potassium in 20-40 and 40-60 cm soil layers decreased first and then increased with the increase of flooding time.The longer the flooding time of 20-40 and 40-60 cm soil layers,the lower the soil organic matter content overall,but the organic matter content of 0-20 cm soil layer increased first and then decreased with the increase of flooding days,and the organic matter content was the highest in 10-12 days.In summary,due to the different ways and mechanisms of soil nutrient transformation and migration,summer maize field with different flooding days shows different profile distribution characteristics of soil nutrient.It is suggested that nitrogen fertilizer should be supplemented in time in flooded farmlands,and green manure should be supplemented in time to increase soil organic matter content.
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